CVE-2026-104286 - Fortinet FortiMail Path Traversal Vulnerability (known exploited)
Added to CISA KEV on 2026-10-01. Fortinet FortiMail contains a path traversal and an improper neutralization of NULL byte or NULL character vulnerability that may allow an unauthenticated attacker to write arbitrary files on the underlying system via crafted HTTP or HTTPS requests.
CRITICAL
CISA KEV
ACTIVELY EXPLOITED
Severity & confidence
Source severitycritical
Platform severitycritical
Confidenceconfirmed
Exploitationactively exploited
CVSS-
Affected
Vendorsfortinet
ProductsFortiMail
Reporting sources (3)
CISA - Known Exploited Vulnerabilities
CISA - Cybersecurity Advisories
NIST NVD - National Vulnerability Database
๐ฏ Why should I care?
- On the CISA Known Exploited Vulnerabilities list.
- Credible sources report active exploitation in the wild.
Timeline & provenance
Published2026-10-01T00:00:00
Last updated2026-10-21T04:58:06
Ingested2026-10-01T20:06:11
FreshnessNEAR-REAL-TIME
Threat typeexploitation
Recommended action
Apply the vendor-supplied patch immediately. Review vendor and CISA guidance for detection and mitigation.
Next steps
- Identify affected systems in your environment.
- Apply the vendor patch or mitigation guidance.
- Review logs for indicators described in the advisory.
- Follow the affected vendor/product to track updates.
Confidence explanation
This object is reported by 3 independent sources.
Source type: gov ยท Original: CISA - Known Exploited Vulnerabilities
